Spring和MyBatis整合自动生成代码里面text类型遇到的坑

Z时代
2024-01-10
分类：综合

Spring和MyBatis整合以后，使用自动生成代码工具生成dao和mapper配置文件，生成步骤如下（以Intelli idea为例）。

1.编写生成代码配置文件generatorConfig.xml。


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
    PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
  <classPathEntry location="D:\dev\maven\repository\mysql\mysql-connector-java\5.1.39\mysql-connector-java-5.1.39.jar"/>
  <context id="DB2Tables" defaultModelType="flat" targetRuntime="MyBatis3">
    <commentGenerator>
      <property name="suppressDate" value="true"/>
      <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
      <property name="suppressAllComments" value="false"/>
    </commentGenerator>
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql://localhost:3306/mycollege?characterEncoding=utf-8"
            userId="root"
            password="root">
    </jdbcConnection>
    <javaTypeResolver>
      <property name="forceBigDecimals" value="false"/>
    </javaTypeResolver>
    <!-- 生成模型的包名和位置 -->
    <javaModelGenerator targetPackage="com.cx.elearnning.model"
              targetProject="src/main/java">
      <property name="enableSubPackages" value="true"/>
      <property name="trimStrings" value="true"/>
    </javaModelGenerator>
    <!-- generate xml -->
    <sqlMapGenerator targetPackage="/"
             targetProject="src/main/resources/mapper">
      <property name="enableSubPackages" value="true"/>
    </sqlMapGenerator>
    <!-- generate Mapper -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.cx.elearnning.dao"
               targetProject="src/main/java">
      <property name="enableSubPackages" value="true"/>
    </javaClientGenerator>
   <!--需要自动生成的表名和对应的model名-->
    <table tableName="sys_user" domainObjectName="SysUser"></table>
  </context>
</generatorConfiguration>

2.配置如下maven运行命令。

3.运行generatorcode即可。

问题描述

假如数据库表里面存在text或者blob字段。自动生成的数据库配置文件如下，会多出几个以withBlobs结尾的方法和resultMap：


<!--仅仅贴上不一样的部分-->
<resultMap extends="BaseResultMap" id="ResultMapWithBLOBs" type="com.cx.elearnning.model.EduWebsiteProfile">
  <!--
   WARNING - @mbggenerated
   This element is automatically generated by MyBatis Generator, do not modify.
  -->
  <result column="DESCIPTION" jdbcType="LONGVARCHAR" property="desciption" />
 </resultMap>
<select id="selectByExampleWithBLOBs" parameterType="com.cx.elearnning.model.EduWebsiteProfileExample" resultMap="ResultMapWithBLOBs">
  <!--
   WARNING - @mbggenerated
   This element is automatically generated by MyBatis Generator, do not modify.
  -->
  select
  <if test="distinct">
   distinct
  </if>
  <include refid="Base_Column_List" />
  ,
  <include refid="Blob_Column_List" />
  from edu_website_profile
  <if test="_parameter != null">
   <include refid="Example_Where_Clause" />
  </if>
  <if test="orderByClause != null">
   order by ${orderByClause}
  </if>
 </select>